Magnetic brake



Jan. 27, 1931. c, lc. FARMER y 1,790,129@

mimmo 'BRAKE Filed-Feb.. 17341928 2 s neetsf-snmq.

a I a 'l v v @nu 'It Ii l INVENTOR "f' W CLYDEC-FARMER ATTORNEY Javi-I'.27, 1931. c, C, FARMER 1,790,208.

MAGNETIC BRAKE Filed Feb.. 17, 1928 'ZS'leetssheet 2.

INVENTOR CL YDE C. FARMER ATTORNEY to amagnetic brake vshoe inproportionto the .degree ofv application. ofthe fluid pressure Patented Jan. 2,7,1931 *stares .PAT-Em 4j l GLYDEy c. rAnMER, orl rlrrrsBUnGrI,PENNSYLVANIA., A ssIGNon'ro 'rien :WnsTING- y HoUsn Ain BRAKE COMPANY,.or.Wrravinen1Nof,V PENNsYLVANiA, A, CORPORATION f Yor rENNsYLvAN- IA`MAGNETICJSR-nieu ApplicationledgFebruary 17, 19248.. Serial -No.`2555935.

This invention relates to magnetic brakes, andmore,particularly of vthetype employingap'magnetic brake shoe adapted to engage the rail Aandassociated With afluidpressure operated Wheelbrakeapparatus.

Oneobject of myinvention Vis to provide means operated upon initiatingyan applica-A tion ofA the brakes for :moving the magnetic brake shoefrom a position above the rail,

finto .engagement Withthe rail.

Another object of my invention is to provide meansforva-rying thecurrent supplied brake. y In the accompanying. drawings; Fig. 1 is a`diagraininatic vien7 of brake equipment .embodying -myinve1ition;andfFig. 2a diagrammatic view of .a brake .equipment,show-4.fing a `slightlymodified.forni ofmy invention .-for varying thevcurrent suppliedlto the magnetic brake shoe in .proportionto.thexdegree ltlieflliidpressure' brakes are applied- As shown inFig. 1,.the brakeequipment l,may comprise amagneticbrake shoe 1 which isnormally held suspendeda-Way .from each rail'2 by means of coil springs3, .securedfto the car body as indicatedat A. A fluid pres-V fsure'brake isprovided comprisingA a brake ,cylinder 1 having apistonr-od5Which is ,'connectedto a lever/6 `fulcrumedon thecar.

. levers'lO,v and llrfbeinglconnected by.`afrodv Brake shoes 6 :and 7,ladaptedto engage car `Wheels and 9 respectively, are operativelyconnected, the brake shoe 6 to a live lever 10 andthebrake shoe 7tovadeadjlever 11, the

12, and-the livelever 10`-by arod 13. Withthe '-lever 6.

It Willbe Vunderstoodthat the actual brake glevenm'echanism as employedon,a car is. not :shown in the drawing,- the arrangementshovvn beingmerely .a .diagrammatic construction invention;

,-sufiicient v.to Yillustrate the .operation of my ,t moving the`magnetic brake shoe V1 to engageinentfwith"l the ra-il when' the brakeslare' aptionl 1B. of the vcar, and havngthe end @tiene ment with-the'rail 2.

Awrdng t0 .my nventiel, yfilleuls, 011

,forlsupply' gcull arm proiiided roller 15 adaptedfto engagethe top`facejof the brake shoe 1. The 4.

-endof `theiother arm'is connected by -a coil spring` 16 withxtheup'perend .of the live lever 1 0. y u 4 The pipe 17, through which `Huidunder pressure is-.suppli'edto andreleased fro-inthe connectedat one endtoacurrent supply Wire- 23, and having a movable Contact member 24,

ffulcrumed 1at25, and .connected jto the 4piston vbrake cylinder Il'isalso connected to a cylnader-18 Which contains a piston 19, subject,v

von. oneside to the Vpressure offacoil spring 20 '6u-v providedfhaving avariable resistance'coil 22 rod -21.V The 4member 221 isvelectrically?con-` Y In operation, Whenythe brakes are released,

theparts arein the positionshown in Fig. 1,

`20, so thatnocurrentissuppliedto the magnetic brake shoe 1.;

The brakesare applied by supplyingfiluid `under pressure through. pipe17 to the brake cylinderliin the usual manner. and the usual brakecylinder piston (not shown) inthe brake Vcylinderll operates through therod 1,3 andthe ievefeiogaad n to Cause, the. brake' lWith. the magneticbrakevshoe 1,v held sus-Y` shoes 6 andftoengage the'car WheelsSjand 9.

. 4vThe movement of the livegleverlOinapplyfV that the roller15foperates to pressthe magnetic brake shoevl' downwardly intoengage'-VA s the fluidpressure in the brake A(,)vercomes lthe resistance ofspringfQO and thecontactfinemberll iscausedvto engage the Aing;the,brakes acts throughthe springrlj to 7;

iii)

, 'Cylinder-4 in creases, the pressure actingron piston 19l j Y .95Voir* piston-19 is moved ltoward the right,'fso' that i resistance coilfaridtherebyfclose the circuit Y te' ilieieeeneticbrak@ mn The extent toWhich the contact member 24 is moved toward the right depends upon thedegree of pressure of fluid supplied to the brake cylinderv 4 and as thebrake cylinder Vpressure is increased, the contact member is u cylinderpiston rod and at the other end to a pull rod 2i8, through which thebrake shoes of a pair of Wheels are operated. The Vbrake lever 29 isconnected at one end to a pull rod 30, through Ywhich the brake shoes`otanother pair of Wheels 'are operated. The other end of lever 29 ispivotally connected to a ulcrum member 3l, which extends throughan'opening in 'a bracket-32 secured tothe car and Which is provided witha collar 33 adapted tact arm 24', so as to eectcontact with theVresistance coil 22. The circuit to Vthe magto engage the `bracket 32 andsubject tothe pressure cfa spring -34.

The Contact arm 24k of the rheostat is fulcrumed at 35 and'isoperatively connected through a link 36 with the lever 29. i'

With this construction, Whenthe'brakes are applied by supplying Huidunder pressureto the brake cylinder 4, the :torce With which the brakesare applied acts through lever 29 on the fulcrum member 31 and tends `tomove thecollar 33 away from the bracket against the pressureot.springy34 and in ,proportion to the force with which the brakes are applied.

The movement of ythe ulcrum member 31 toward the left causes movement ofthe connetic brake shoe l is thus closed and the brake'shoe isenergizedrto eiecta braking actionon the rail.

rlh'e'greater the force With which the brakes are applied,the,greaterthemovement' of the memberl toward the left, 'and the greaterfthe movement of the Contact arm24f to Are- Y duce the resistance of thecoil in the circuit.

Nhile one illustrative embodiment of the .invention has beendescribed'in detail, it is notmy intention to" limit lits scope'to that.embodiment o r otherwise than by the terms ofthe appended claims. Y

Having now described my invention, What Iclaim as newand desire' tosecure by Letters lPatent, Vis

l. ThecombinationWithaymagnetic brake "shoe, Wheel brakes, andfmeans`for applying lf'vnected to 'and operated upon applyingthe the Wheelbrakes, of meansmechanically con- Wheel brakes vfor moving the magneticbrake shoe into engagement With the rail.

2. Thecombination with a magnetic rail engagingbrake shoe and a wheelbrake apparatus, of means mechanically connected to and operated uponapplying the Wheel brakes f g for moving the magnetic brake shoe intoengageinentvwith the rail. 3. The combination With a magnetic rail brakeshoe, Wheel brakes, and a brake appa- .ratus operated by iuid underpressure for controlling the Wheel brakes, of a member mechanicallyconnected to the Wheel brake apparat-us for moving the magnetic brakeshoe tothe rail upon applying the Wheel brakes.

4. The combination Witha magnetic rail brake shoe, of Wheel brakes,alever through which the Wheel brakes are applied, and a memberoperatively connected to said lever" and engaging said magnetic brakeshoe for moving the magnetic brake shoe to engage the railupon movementlof said lever to apply the Wheel brakes. l

5. The combination with a magnetic railfi brake shoe, of Wheel bra.kes,abrake lever through which the Wheel brakes are applied, and a leverulcrumed on the vehicle and engaging said magnetic brake shoe.

6. The combination WithamagneticV rail brake shoe, of Wheel brakes` abrake lever through Which the Wheel brakes are applied,

' operatively connected to said brake lever and a fulcrumed lever, landa spring connecting one end of said lever with said brake lever,

the other end Vof said fulcrumed lever engaging said magnetic brakeshoe.

7. The combination With a magnetic rail brake shoe Yand a Wheel brakeapparatus, of

means operated upon applying the Wheel brakes for lirst closing acircuit for supplying current tothe magnetic brake'shoe and then varyingthe current supply. f

8. The combination With brake shoe and a Wheel brake apparatus, of meansfor yvarying the Ycurrent supplied tothe magnetic brake shoe inlproportions tothe forcewith'which the Wheel brakesare applied.

9. vThecombination Xvith a-magnetic rail brakeshoe and a Wheel brakeapparatus, of

a magnetic rail y a resistance and means "'for supplying cur-` Y rent tothe magnetic brake shoe through lsaid resistance upon applyingthe"vvheel brakes and operative to cut down the resistanceV in"" thecircuit as thefforcejwth which. the Whel brakes are applied isincreased.' f v 1 0. The Vcombination vvvW1 operated by thepressure offiuid supplied to' operate theluid ,pressure brakes for first closing acircuit through vwhich current isV th' a "magnetic brake and a wfluidpressure'brake, Aof means supplied tothemagneticbrake and forf'vary- Ying the current according to the pressure ot fluid supplied.

11. The combination With a magnetic brake and a Huid pressure brake, ofmeans operated according to the pressure of fluid supplied inapplyingthe iuid pressure brakes for varyingthe current to said magnetic brake.

12. The combination with a magnetic Vbrake and a fluid pressure brake,of a rheostat andV means for operating said rheostat m to vary thecurrent supplied to said magnetic brake in proportion to the degree offluid pressure supplied to apply the fluid pressure Y brakes.

13. TheA combination with a magnetic` brake and a brake cylinder, of acontact arm movable to vary the resistance in the circuit of themagnetic brake and a piston connected to said arm and operated by fluidnder pressure supplied to the brake cylink 14. The combination with amagneticl brake and-a brake cylinder, of a contact arm ymovable to varythe' resistance in the'circuit vof the magnetic brake, a sprinqand a pis..5 ton subject to the opposing pressures of the spring and thepressure'of fluid supplied to the brake cylinder foroperating said conytact arm..

15. The combination With a magnetic rail 30 brake shoe, -of meansoperated by variations in uid pressure for varying the current suppliedto said shoe and manually operable means for controllingV the fluidpressure onV said varying means.

16. The combination with a magnetic brake shoe, ofa variable resistancein the energizing circuit of said slice,l a rotatable device, rotatableto vary` the amount of said variablev resistance in said circuit, aluidpressure operated device for actuating said rotatable device, and amanually controlled valve for controlling the fluid pressure on said uidpressure operated device.

Y In'testimony whereof I .have hereunto set v my hand. Y

f CLYDE C. FARMER.

